Asan ÖMÜRALİEV | Ramiz RAFATOV

Article | 2011 | Automation and Remote Control72 ( 1 )

For the singularly perturbed parabolic problem, a regularized asymptotics of the solution of the problem of optimal control was constructed. The solution asymptotics involves parabolic boundary-layer functions obeying a special function called the “complementary probability integral.

Ali Osman SOLAK

Article | 2011 | Journal of Computational and Theoretical Nanoscience8 ( 10 )

This paper presents the Pseudo phase plane (PPP) method for detecting the existence of a nanofilm on the nitroazobenzene-modified glassy carbon electrode (NAB-GC) system. This modified electrode systems and nitroazobenze-nanofilm were prepared by the electrochemical reduction of diazonium salt of NAB at the glassy carbon electrodes (GCE) in nonaqueous media. The IR spectra of the bare glassy carbon electrodes (GCE), the NAB-GC electrode system and the organic NAB film were recorded. The IR data of the bare GC, NAB-GC and NAB film were categorized into five series consisting of FILM1, GC-NAB1, GC1; FILM2, GC-NAB2, GC2; FILM3, GC-NAB3 . . ., GC3 and FILM4, GC-NAB4, GC4 respectively. The PPP approach was applied to each group of the data of unmodified and modified electrode systems with nanofilm. The results provided by PPP method show the existence of the NAB film on the modified GC electrode. - Keywords: CORRELATION; MODIFIED GLASSY CARBON ELECTRODE; MUTUAL INFORMATION; NANO-FILM; NANOANALYSIS; PSEUDO PHASE PLANE METHO More less

Ali Osman SOLAK

Article | 2011 | Instrumentation Science & Technology39 ( 2 )

Benzo[c]cinnoline (BCC) molecules were electrochemically grafted onto a glassy carbon (GC) surface in nonaqueous media, and the modified surface was characterized using cyclic voltammetry (CV) with redox probes. Blockage of the electron transfer on the modified surface was observed using redox probes. Electrocatalytic effect of 2BCC modified GC (2BCC-GC) electrode surface towards to the electrochemical reduction of dioxygen was also investigated. A mechanistic scheme for the electrochemical catalysis was proposed. To clarify the mechanism of the dioxygen reduction, a less basic film of 2-benzo[c]cinnoline 6-oxide (2BCCNO) molecules . . .was also prepared at the glassy carbon surface. The effect of electrochemical catalysis of dioxygen reduction at the 2BCC-GC surface was compared to that at the 2BCCNO-GC surface. - Keywords: 2-benzo[c]cinnoline modified electrode, benzo[c]cinnoline, cyclic voltammetry electrocatalytic dioxygen reduction, electrochemical modificatio More less

Ali Osman SOLAK

Article | 2011 | Polyhedron3 ( 10 )

This paper presents a new azacrown containing vic-dioxime; anti-N-(4-aminophenyl)aza-15-crown-5-glyoxime (LH2), and its mononuclear nickel(II), copper(II), cobalt(II), cadmium(II) and zinc(II) complexes. The azacrown moieties appended at the periphery of the oxime provide solubility for the vic-dioxime ligand and complexes in common organic solvents. The mononuclear M(LH)2 (M = Ni and Cu), M(LH)2(H2O)2 (M = Co) and [M(LH)(H2O)(Cl)] (M = Cd and Zn) complexes have been obtained with the metal:ligand ratios of 1:2 and 1:1. The structure of the ligand is confirmed by elemental analysis, Fourier transform infrared (FT-IR), ultraviolet–vi . . .sible (UV–Vis), mass spectrometry (MS), one-dimensional (1D) 1H, 13C NMR, distortionless enhancement by polarization transfer (DEPT) and two-dimensional (2D) heteronuclear single quantum coherence (HSQC) and heteronuclear multiple bond correlation (HMBC) techniques. The structures of the complexes are confirmed by elemental analyses, MS, UV–Vis, FT-IR and 1H, 13C NMR techniques. Redox behaviors of the ligand and its complexes have been investigated by cyclic voltammetry at the glassy carbon electrode in 0.1 M TBATFB in DMSO. The antibacterial activity was studied against Staphylococcus aureus ATCC 29213, Streptococcus mutans RSHM 676, Enterococcus faecalis ATCC 29212, Lactobacillus acidophilus RSHM 06029, Escherichia coli ATCC 25922, Pseudomonasaeruginosa ATCC 27853. The antimicrobial test results indicate that all the complexes have low levels of antibacterial activity against both Gram negative and Gram positive bacterial species. - Keywords: vic-Dioxime; Azacrown ether; Macrocyclic ligand; Metal complexes; Cyclic voltammetry; Antimicrobial activit More less

Ali Osman SOLAK

Article | 2011 | Analytical Methods3 ( 11 )

In this study, electrochemical modification of a glassy carbon (GC) electrode with apigenin was carried out and the modified electrode was used for determination of copper(II) (Cu(II)) in soil samples. The GC was modified through the electrochemical polymerization of apigenin (PolyApi/GC) on the electrode surface in aqueous media. The electrode surface was modified with apigenin in phosphate buffer solution (PBS), pH 7, from 0 mV to +1400 mV potential ranges, using 100 mV s−1 sweep rate and 30 cycles by cyclic voltammetry (CV). The surface characterizations of this sensor electrode were performed by CV, electrochemical impedance spe . . .ctroscopy (EIS) and scanning electron microscopy (SEM). Britton-Robinson (BR) buffer solution at pH 5 was used for determination of Cu(II) by differential pulse voltammetry (DPV). The detection limit was obtained as lower as 1.0 × 10−11 M. By using this calibration curve, the amount of Cu(II) was determined as 7.34 × 10−7 M in soil samples. The results showed that pH, incubation time and interferences of some cations and anions were significant More less

Ali Osman SOLAK

Article | 2011 | Автономия личности3 ( 1 )

В работе рассматриваются педагогические условия эффективности педагога: обеспечение объективного контроля деятельности студента, выбор адекватных методов взаимодействия со студентами на основе педагогики сотрудничества, активизации двигательной и мыслительной деятельности студентов, опора на личность, его склонности и способности и рейтинговый контроль. The article is devoted to the conditions of improving effectiveness of teacher. We consider the provision of objective control over the activities of student. In this paper we describe the selection of adequate methods of interacting with students which is based on the pedagogy of c . . .ooperation and activation of motor and cognitive activities More less

Şamil SEFERGİL

Article | 2011 | Atatürk Üniversitesi Veteriner Bilimleri Dergisi6 ( 1 )

Bu çalışma yerli ördeklerin cloaca’sının yerini, komşuluklarını, makroskobik ve subgross yapılarını belirlemek amacı ile her iki cinsiyetten altı adet hayvan kullanılarak yapıldı. Bu amaçla anestezi sonrası uyutulan ördeklerin cloaca’sı ve bağırsaklarına tespit, yıkama, alkol ve aseton serisi, gliserola gömme, alkyd resin içeren vernik ve tiner solüsyonunu emdirme ve kurutma işlemleri uygulandı. Bu işlemlerden sonra cloaca ve yapıları diseksiyon mikroskobu ile incelendi ve resimlenerek sunuldu. Rectum’un genişlemesinden oluşan cloaca’nın jejunum, duodenum, cecum, bursa cloacalis ile komşu olduğu, coprodeum, urodeum ve proctodeum adl . . .ı boşluklardan oluştuğu tespit edildi. Bu bölümler arasında önden arkaya doğru plica rectocoprodealis, plica coprourodealis ve plica uroproctodealis adlı üç plikanın bulunduğu, urodeum’a ureter, erkekte ductus deferens’in; proctodeum’a ise bursa cloacalis’in açıldığı belirlendi More less

Zafer GÖNÜLALAN

Article | 2011 | Food Control22 ( 12 )

The aim of this study was to examine the presence of aflatoxin M1 (AFM1) in dairy product samples by enzyme-linked immunosorbent assay (ELISA). Aflatoxin M1 were found in 135 (64%) out of 210 analyzed samples. Only 7% of dairy product samples were contaminated at levels above the legal limits. AFM1 was detected in 43 (86%) of milk samples (ranging from 1 to 30 ng/l), in 38 (63%) of cheese (ranging from 12 to 378 ng/kg), in 28 (56%) of yoghurt (ranging from 2.5 to 78 ng/kg) and in 26 (52%) of dairy dessert samples (ranging from 1.5 to 80 ng/kg). None of the raw milk samples contained levels above the Turkish legal limit. The AFM1 lev . . .els of 7(14%) yoghurt, 5 (10%) dairy dessert and 3 (5%) cheese samples were above the limits of the Turkish Food Codex. It is emphasized that the presence of AFM1 in dairy products may be regarded as a potential hazard for human health More less

Ali Osman SOLAK

Article | 2011 | Analytical Methods136 ( 7 )

The scope of this study is to modify a Surface Plasmon Resonance (SPR) sensor slide with isophthalic acid to evaluate the possible application on the detection of copper(II) ions in aqueous media by total internal reflection ellipsometry. A gold sensor surface was modified by an electrochemical diazonium reduction modification method. The modified surfaces are characterized with cyclic voltammetry (CV) and ellipsometry. Isophthalic acid monolayer modified gold slides were used for in situdetection of aqueous Cu2+ solution with the SPR enhanced total internal reflection ellipsometry (SPRe-TIRE) technique. Layer formation, pH dependen . . .cy of adsorption, sensor response of the SPRe-TIRE and isothermal kinetic parameters were examined. A high dependency on the number of CV cycles in the monolayer–multiple layer transition was observed. The suggested sensor gave a linear response over a wide range of Cu2+ concentrations. It was also reported that adsorption on the SPRe-TIRE sensor gave Langmuir adsorption model behavior More less

Avıt ASANOV

Article | 2011 | Доклады Академии Наук437 ( 5 )

Ali Osman SOLAK

Article | 2011 | Analytical and Bioanalytical Electrochemistry3 ( 2 )

In this paper, apigenin (AG) and naringenin (NG) have been studied with the cyclic voltammetric technique using the glassy carbon (GC) electrode. The modification was carried out only in non-aqueous media, while the electrochemical characterization was done in both aqueous and non-aqueous media. 0.1 M tetrabutylammonium tetrafluoroborate (TBATFB) in acetonitrile (MeCN) was used in non-aqueous experiments, Britton-Robinson (BR) buffer solution (pH=2) and 0.1 M KCl solution were used in aqueous experiments. Surface modification experiments were performed in the +0.3 V and +2.8 V potential ranges with a scan rate of 0.1 Vs-1 and 10 cyc . . .les for two molecules. The presence of AG and NG at the GC electrode surface was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), contact angle measurement (CAM) technique and atomic force microscopy (AFM). We also investigated the electrochemical oxidation of AG and NG in non-aqueous media and propose a grafting mechanism of AG and NG to the GC electrode surface. - Keywords: Flavonoid, Electrochemical Oxidation, Surface Modification, Surface Characterizatio More less

Cıldız URMANBETOVA

Article | 2011 | Россия и мусульманский мир ( 10 )

«Центральная Азия и Кавказ», Лулео (Швеция), 2010 г., т. 13, вып. 3, с. 177-184.